107 lines
2.7 KiB
JavaScript
107 lines
2.7 KiB
JavaScript
/**
|
|
* @license Apache-2.0
|
|
*
|
|
* Copyright (c) 2018 The Stdlib Authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
// MODULES //
|
|
|
|
var MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
|
|
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
|
|
var isEnumerableProperty = require( '@stdlib/assert/is-enumerable-property' );
|
|
var getOwnPropertyNames = require( './../../property-names' );
|
|
var getOwnPropertySymbols = require( './../../property-symbols' );
|
|
var getPrototypeOf = require( './../../get-prototype-of' );
|
|
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Returns an array of an object's inherited enumerable property names and symbols.
|
|
*
|
|
* @param {*} value - input object
|
|
* @param {PositiveInteger} [level] - inheritance level
|
|
* @throws {TypeError} second argument must be a positive integer
|
|
* @returns {Array} a list of inherited enumerable property names and symbols
|
|
*
|
|
* @example
|
|
* var props = inheritedEnumerableProperties( {} );
|
|
*/
|
|
function inheritedEnumerableProperties( value, level ) { // eslint-disable-line id-length
|
|
var props;
|
|
var cache;
|
|
var obj;
|
|
var tmp;
|
|
var N;
|
|
var n;
|
|
var k;
|
|
var i;
|
|
|
|
if ( arguments.length > 1 ) {
|
|
if ( !isPositiveInteger( level ) ) {
|
|
throw new TypeError( 'invalid argument. Second argument must be a positive integer. Value: `' + level + '`.' );
|
|
}
|
|
N = level;
|
|
} else {
|
|
N = MAX_SAFE_INTEGER;
|
|
}
|
|
if ( value === null || value === void 0 ) {
|
|
return [];
|
|
}
|
|
// Get the value's prototype:
|
|
obj = getPrototypeOf( value );
|
|
|
|
// Walk the prototype chain collecting enumerable properties...
|
|
props = [];
|
|
cache = {};
|
|
n = 1;
|
|
while ( obj && n <= N ) {
|
|
tmp = getOwnPropertyNames( obj );
|
|
for ( i = 0; i < tmp.length; i++ ) {
|
|
k = tmp[ i ];
|
|
if (
|
|
hasOwnProp( cache, k ) === false &&
|
|
isEnumerableProperty( obj, k )
|
|
) {
|
|
props.push( k );
|
|
}
|
|
cache[ k ] = true;
|
|
}
|
|
tmp = getOwnPropertySymbols( obj );
|
|
for ( i = 0; i < tmp.length; i++ ) {
|
|
k = tmp[ i ];
|
|
if (
|
|
hasOwnProp( cache, k ) === false &&
|
|
isEnumerableProperty( obj, k )
|
|
) {
|
|
props.push( k );
|
|
}
|
|
cache[ k ] = true;
|
|
}
|
|
obj = getPrototypeOf( obj );
|
|
n += 1;
|
|
}
|
|
|
|
return props;
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = inheritedEnumerableProperties;
|